D9: O2 Sensor Screen Ground Continuity

With EM012 & EM022 disconnected, measure the resistance between EM012/022 & EM022/001

Is the resistance < 0.5 ohms

Yes
Go to D10

No
Inspect connectors EM012, & EM022 for corrosion, damaged/pushed back pins or repair the harness; reconnect plug(s)
Go to D11